I wouldn't necessarily get a new PH, but look into the maxi-jet mod kits, it will change them from shooting(blasting) jets of water to a low velocity/high volume widely dispersed flow, which is what you want, not directly blasting your corals with a jet of water. Mixed turbulent flow, lots of it.
Also, trying to keep softies with these guys can be problematic sometimes from toxins the softies can release into the water(mainly Leather type corals), the carbon you run should be able to keep this under control, I'd make sure I kept it changed on a regular basis if you decide to continue to use, I use a product called Purigen from Seachem, is a better Carbon substitute, IMO, not as harsh but every bit as good if not better. Also, softies can tend to move around some, I'm speaking of Mushrooms mostly moving when they are reproducing, but Leathers drop babies too, so be careful. I am slowly removing all my Mushrooms from my tank, because they tend to migrate to lower areas of flow and in the process, make their way towards some of my SPS(the SPS will lose every time, not saying that it can't survive contact, but the area that is being touched will die(it can grow back, but usually will take a long time to heal these areas). I will only keep Zoa's and some Xenia with my SPS. Same goes for Anenomes, not a good idea(in case you were thinking of one of these), IMO.
